Cryage wrote:Staff of Light - is it still a power weapon?
Do the rules say it's a power weapon? Nope.
Scarabs - These have been changed to "beasts" so do they only move 6" with the 1d6" run (they have fleet so they can assault 12") - I assume they lost their turbo boost and now they can't just hop over cover ? :(
Can beasts turboboost? Nope.
Praetorians - is there a point at all to selecting this unit? 6 str pistol, but 12" range makes them susceptible to plenty of guns to kill them (especially no invul save).
Ehhh, they might have their uses, but seem subpar to me so far.
The ghost arks - can you move 12" cruising speed and can the crew fire from the open topped, or is it just the 6" combat speed?
Skimmers follow the same rules as any other vehicle but with the exceptions in the book. So no, if you move at cruising speed or faster, the passengers can't fire out of the vehicle.
Alternatively, doomsday ark, can it move 12" and fire the doomsday cannon's lower profile or just the defensive array guns?
Unless it's a fast vehicle, only defensive weapons.
Also what does 'broadsiding' mean? Does it mean the 2 arrays can simply fire at seperate units?
Broadside means the weapons are on the side of the vehicles. The rules in the codex are very clear on how targetting works.
That being said - how do "Fast" Skimmers work in conjunction to moving & shooting? From what I understand Moving "Flat out" (up to 18") you can't fire anything (aside from defensive weapons if I'm not mistaken...), however the 12" cruising speed, you can fire 1 weapon along with defensive weapons... am I correct? Mind you , Doom Scythe & Night Scythe has "aerial assault" so it doesnt really matter

Can't fire any weapons at all when moving flat-out. Otherwise you are correct.
With the death ray from the doomscythe, if I draw a line through an Ork Boy squad of 30, and it goes through 10 of the units, does that give me 10x30 hits (300 hits?!) at str 10 , or just the 30 hits ?
Just 10 hits. Be careful of your use of the words 'unit' and 'model'...they are very, very different terms in the context of the game.
Can Cryptek's start the game inside a Ghost Ark along with a squad of 8-9 warriors (so 1-2 Cryptek's)? This is assuming I have an Overlord to support the Royal Court of course
Yes as they effectively turn into 'sergeants' similar to wolf guard. As the way the rules are currently written the only way you can have 2 Crypteks join is if you take two Royal Courts.....though I'd expect this to be
FAQ'd so that only one can every join.